Fix protonmail fingerprint extraction

bin/mw

@@ -208,7 +208,7 @@ EOF
 }
 
 protonfinger() { printf "Getting Protonmail bridge fingerprint...\\n"
-	fingerprint="$(msmtp --serverinfo --host=127.0.0.1 --port=1025 --tls --tls-certcheck=off)" || return 1
+  fingerprint="$(msmtp --serverinfo --host=127.0.0.1 --port=1025 --tls --tls-certcheck=off | grep SHA256: | sed 's/^.*: //')"
 	sed -ibu "s/account $title/&\ntls_trust_file\ntls_fingerprint $fingerprint/" "$msmtprc" ; rm -f "$msmtprc"bu
 }